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Adaptive Signals 101

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  • 1. AN INTRODUCTION TO
  • 2. Outline Example of systems & definition How did Sain get involved? Scan Tour & ALDOT’s reaction How it works  Different systems Graphs Status of ALDOT ProjectsJAN 24 2012 INTRO TO ADAPTIVE SIGNAL CONTROL 2
  • 3. Example of Systems InSync SCATS SCOOT ACS Lite Several others…JAN 24 2012 INTRO TO ADAPTIVE SIGNAL CONTROL 3
  • 4. Definition Traffic signal timing control technology that has the ability to utilize real-time traffic information to adjust traffic signal system timings in an effort to reduce congestion and delay.JAN 24 2012 INTRO TO ADAPTIVE SIGNAL CONTROL 4
  • 5. How did we get involved? FHWA Every Day Counts (EDC)  EDC is designed to identify and deploy innovation aimed at shortening project delivery, enhancing the safety of our roadways, and protecting the environment. Adaptive Signal Control Subcommittee  Members consist of ALDOT, FHWA, City of Montgomery, and Sain Associates  Sain is the only consultant on the committee!JAN 24 2012 INTRO TO ADAPTIVE SIGNAL CONTROL 5
  • 6. Committee Members FHWA  Jeff Dogan ALDOT  Stacey Glass, Gary Moore, Kim Norton, Robert Blankenship City of Montgomery  Bubba Bowden, Tim Foster Sain Associates  Jeff StephensonJAN 24 2012 INTRO TO ADAPTIVE SIGNAL CONTROL 6
  • 7. Scan Tour: Sep. 12-142011 Visited 3 locations in GA  (1) City of Alpharetta 3 1 ○ Tested InSync, SCOOT 2  (2) Columbia County ○ Running InSync  (3) Cobb County ○ Running SCATS Group recommended SCATS to ALDOT front office for initial implementation in ALJAN 24 2012 INTRO TO ADAPTIVE SIGNAL CONTROL 7
  • 8. ALDOT InitialImplementation (1) Montgomery  Southern Boulevard/Eastern Boulevard (2) Birmingham area  US-280 3 2 1 (3) Huntsville  Governors DriveJAN 24 2012 INTRO TO ADAPTIVE SIGNAL CONTROL 8
  • 9. Signal Timing Methods Free/Isolated Time Based Coordination Traffic Responsive Adaptive ControlJAN 24 2012 INTRO TO ADAPTIVE SIGNAL CONTROL 9
  • 10. Adaptive Control – How? The tactics of different systems work different ways, however… The general idea is that data being collected by the vehicle detectors is being used in real time to determine the signal timings. Wide range of % reductions in delay reported by various adaptive signal controlsJAN 24 2012 INTRO TO ADAPTIVE SIGNAL CONTROL 10
  • 11. SCOOT Split Cycle Offset Optimization Technique Used worldwide, a lot in Great Britain Uses data from advance detectors, models progression from detector to stopline Factors for queuing Central server and on-street firmware Requires communication Need computer programming background to understand system commands required to operate and maintain the systemJAN 24 2012 INTRO TO ADAPTIVE SIGNAL CONTROL 11
  • 12. InSync Rhythm Engineering Plug-and-play Controller set in free mode using existing firmware Detector data taken, analyzed, and sends calls to controller Requires communication Newer program, still customizing on the fly to meet customers needsJAN 24 2012 INTRO TO ADAPTIVE SIGNAL CONTROL 12
  • 13. SCATS Sydney Coordinated Adaptive Traffic System Originated in Australia, found worldwide, about 1/3 are in Australia Uses stopline video detection (6 x 15 zones) to detect/measure gaps Central server selects pre-determined cycle/split/offsets Communication required Synchro still needed!JAN 24 2012 INTRO TO ADAPTIVE SIGNAL CONTROL 13
  • 14. JAN 24 2012 INTRO TO ADAPTIVE SIGNAL CONTROL 14
  • 15. SCATS (Cont’d) Certain models of controller are required to run SCATS US-280 getting Eagle M50 model Governors Drive getting 2070 SCATS firmware installs alongside traditional firmware on street controller Any mode of detection works, but video is recommended Engineering design element of project is generally required for implementation of equipment modificationsJAN 24 2012 INTRO TO ADAPTIVE SIGNAL CONTROL 15
  • 16. “Never retimed” to“Adaptive”JAN 24 2012 INTRO TO ADAPTIVE SIGNAL CONTROL 16
  • 17. “Retimed” to “Adaptive”JAN 24 2012 INTRO TO ADAPTIVE SIGNAL CONTROL 17
  • 18. SavingsJAN 24 2012 INTRO TO ADAPTIVE SIGNAL CONTROL 18
  • 19. Adaptive vs. TOD 140 120 100 80 Adaptive Cycle 60 TOD Cycle 40 20 0 12 2 4 6 8 10 12 2 4 6 8 10 12JAN 24 2012 INTRO TO ADAPTIVE SIGNAL CONTROL 19
  • 20. ALDOT Project Status Montgomery  PS&E held Jan 4  May 25 2012 Project Letting Birmingham  PS&E is Jan 26  May 25 2012 Project Letting Huntsville  PS&E TBD (Feb 8 or Feb 9)  May 25 2012 Project Letting ALDOT Transportation Director wants all implemented by June 2012JAN 24 2012 INTRO TO ADAPTIVE SIGNAL CONTROL 20

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